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Prevalence of folate and vitamin B12 deficiency in Mexican children aged 1 to 6 years in a population-based survey Cuevas-Nasu,Lucía - Mundo-Rosas,Verónica - Shamah-Levy,Teresa - Méndez-Gómez Humaran,Ignacio - Ávila-Arcos,Marco Antonio - Rebollar-Campos,Ma. del Rosario - Villalpando,Salvador
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